diff --git a/readme.md b/readme.md
index 4dcee7f..2c3de8f 100644
--- a/readme.md
+++ b/readme.md
@@ -2,18 +2,26 @@
 
 ## To do
 
+### Testing/using
+
 - [ ] Write some more complex test programs
     - [ ] Display (hex) numbers
-- [ ] Do a proper binary version... (or lose the typed arrays?)
-- [ ] Extract debugging to its own module
-- [ ] Add a function for logging just a specific range of memory
 - [ ] Think about automated testing
+
+### Features
+
+- [ ] Make $0F a NOP
 - [ ] In assembler.js: validateLabel()
 - [ ] In assemble.js: print better output to stdout
+- [ ] Add a function for logging just a specific range of memory
 - [ ] Add single-stepping 
-- [ ] Make $0F a NOP
 - [ ] Add variables to assembler
 
+### Under-the-hood improvements
+
+- [ ] Do a proper binary version... (or lose the typed arrays?)
+- [ ] Extract debugging to its own module
+
 ## Run the assembler/simulator
 
 Assemble source code: